This is the old one, please check new re-designed app.https://forum.xda-developers.com/android/apps-games/app-reformed-dsp-manager-t3607970
DSP Manager for me is a amazing audio effect. But new features only develop for Omnirom, that's a disappointment. Now with 12 bands equalizer!!!
CPU usage around 35%-60%!!!
So what I done is modifying original DSP Manager source code to add audio framework component into it to make it works, now I'm able to add more new effects and options into it easily. Also, it basically work for any CPU.
Now support LOLLIPOP and Marshmallow devices.

How to install?
1.copy app into your /system
2.copy lib variant of corresponding platform you got.
e.g. For ARM cpu, rename lib_arm to lib and copy it into your /system
For x86 cpu, rename lib_x86 to lib and copy it into your /system
3.copy vendor into your /system

Why use this equalizer/effects?
This is fully open source, no extra code added, check above Github link.
Will NOT deal with anything with SELinux

Current Updates and FUTURE Update:
25th October, 2016
1. Update code in order to compile successfully on latest Clang compiler.
2. Add one more build option, the 'ARM Mode'. I'm not sure it is work for you or not, if it works, it really process faster, and more power saving.

This cannot handle youtube, radio, etc. Because those developer don't use system audio effect. I recommend PowerAMP. It have their own decoder, and then my DSP Manager use individual bass boost on left/right channel, let it sound good.
How do I do 8 bands?
See source code on my Github link. It is not finish yet, I will make better filter roll-off to let frequency response match user need. You might want to try each bands.

XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality.Are you a developer? | Terms of Service